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Ask my future self. Telling my past self something is very likely to have no affect on my life (what if past actions only affect that "me" and not me-me), whereas asking my future self something will always end up with me gaining information - no guarantee its relevant, but it's more likely to be.
Past self wouldn't listen to any sage wisdom I could pass on anyway lol
What would you ask your future self?
"Tell me the most important thing you can tell me"
My future self will know best about what I need to know. Winning lottery/investments can make me rich now, but maybe there's a nuclear war, climate apocalypse, or some other disaster in 5 years and my future self can tell me where to be and what to do before it starts.
Wouldn't the same logic apply from the perspective of future you? I.e. they would be a different future you if they were told something by themselves in the past.